Manuel Ortega-Moral

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Real Adaboost is a well-known and good performance boosting method used to build machine ensembles for classification. Considering that its emphasis function can be decomposed in two factors that pay separated attention to sample errors and to their proximity to the classification border, a generalized emphasis function that combines both components by(More)
This paper shows that new and flexible criteria to resample populations in boosting algorithms can lead to performance improvements. Real Adaboost emphasis function can be divided into two different terms, the first only pays attention to the quadratic error of each pattern and the second takes only into account the " proximity " of each pattern to the(More)
Computer game accessibility for people with limited vision is a challenging problem because many games, such as point-and-click games, heavily rely on mouse interaction for game world exploration. But mouse interaction requires the sense of sight for orientation and navigating through the user interface. Solutions have been proposed to this problem but(More)
—Any new technology introduced in the classroom has a potential risk of increasing the divide for students with disabilities. This impact becomes greater as the new complexity of new technologies increases. In this sense, one of the most complex technologies currently being considered are educational videogames. And while the potential benefits of(More)
Despite the increasing importance of digital games, game accessibility has not yet received enough attention. As a consequence it is unclear how to design games that are engaging and usable also for people with disabilities. This work analyses perceived usability, entertainment and overall experience provided by three interfaces for blind people with(More)
This paper presents a preliminary evaluation of the perceived entertainment value and ease of use of three eyes-free interfaces for point-and-click games. Interface 1 (I1) uses a web-like cyclical navigation system to change the focused interactive element. Interface 2 (I2) uses a sonar to help the user locate interactive elements with the mouse. Interface(More)
– Game·Tel is an open source software system that supports personalized learning, focusing on serious games and simulations, making these and traditional content accessible and adaptive to the student and educational context. In this paper we discuss about its design and functionalities, its modular architecture and the multi-environment approach.
In this paper we propose a new method for training classifiers for multi-class problems when classes are not (necessarily) mutually exclusive and may be related by means of a probabilistic tree structure. Our method is based on the definition of a Bayesian model relating network parameters, feature vectors and categories. Learning is stated as a maximum(More)